What is ASM instance in Oracle 11g?
Oracle – Automatic Storage Management (ASM) ASM is recommended file system for RAC and single instance ASM for storing database files. This provides direct I/O to the file and performance is comparable with that provided by raw devices. Oracle creates a separate instance for this purpose.
What is Oracle ASM stand for?
Automatic Storage Management
Automatic Storage Management (ASM), a feature of the Oracle Database, provides Oracle customers with simplified storage management that is consistent across all server and storage platforms.
What is the use of Oracle ASM?
Oracle Automatic Storage Management (Oracle ASM) is an integrated, high-performance database file system and disk manager. You use Oracle ASM instead of an operating system file system to store your Oracle Database files and, optionally, other files.
What is ASM in RAC?
Using ASM with RAC. ASM is used to automate and simplify the optimal layout of datafiles, control files, and log files. Oracle created Automatic Storage Management (ASM) as an alternative to raw devices and 3rd party clusterware (Veritas Cluster Filesystem) for Oracle Real Application Cluster (RAC) databases.
What is the advantage of ASM in Oracle?
ASM lowers the Oracle database storage total cost of ownership and increases storage utilization while improving performance and availability as compared with traditional file system and volume management solutions. With ASM, less effort is required for managing your database storage environment.
Why do we need ASM?
ASM eliminates the need for you to directly manage potentially thousands of Oracle database files. ASM groups the disks in your storage system into one or more disk groups. You manage a small set of disk groups and ASM automates the placement of the database files within those disk groups.
Is ASM a database?
Automatic Storage Management (ASM) is an integrated, high-performance database file system and disk manager. ASM is based on the principle that the database should manage storage instead of requiring an administrator to do it.
Is ASM mandatory for RAC?
ASM is mandatory for RAC on Standard Edition (SE). For Enterprise Edition (EE) you can use other forms of shared storage that don’t require ASM, but the likelihood is you will use ASM with RAC on EE too. Most of the important ASM skills can be learnt on single instance systems.
Does ASM instance need a Controlfile?
ASM has no files to backup, as its does not contain controlfile,redo logs etc.
Is ASM free?
ASM is a feature of Oracle database providing an integrated cluster file system and volume manager at no additional cost.
Which is the minimum compatible ASM for Oracle 11g?
COMPATIBLE.ASM – The minimum version of the ASM software that can access the disk group. In 11g, the default setting is 10.1. COMPATIBLE.RDBMS – The minimum COMPATIBLE database initialization parameter setting for any database instance that uses the disk group. In 11g, the default setting is 10.1.
What can I use to administer an oracle ASM instance?
You can use Oracle Enterprise Manager and SQL*Plus to perform Oracle ASM instance administration tasks. Oracle ASM is installed in the Oracle Grid Infrastructure home separate from the Oracle Database home. Only one Oracle ASM instance is supported on a server.
Where to place Oracle ASM spfile in cluster?
If you use an SPFILE in a clustered Oracle ASM environment, then you must place the SPFILE in a disk group, on a shared raw device, or on a cluster file system. Oracle recommends that the Oracle ASM SPFILE is placed in a disk group. You cannot use a new alias created on an existing Oracle ASM SPFILE to start the Oracle ASM instance
Do you need grid infrastructure to install ASM?
To implement ASM, you must install Grid Infrastructure. ASM requires unformatted partitions to use as ASM disks and group into ASM diskgroups.. In this topic, you partition the disk to be used by ASM, then use oracleasm to label the the disks for discovery by ASM.